william bosworth on tue 12 nov 96
I have a runny glaze I love. Is there anything I can add to it to stop the
flow somewhat?
Thanks,
Heather Dixon
eaa@hargray.com
Bill Aycock on wed 13 nov 96
At 09:00 AM 11/12/96 EST, you wrote:
>----------------------------Original message----------------------------
>I have a runny glaze I love. Is there anything I can add to it to stop the
>flow somewhat?
>
>Thanks,
>Heather Dixon
Heather-- I'm going to leave the technical answer to the real experts, who
(probably) will first want to know more details of the formulation- but I
have a more personal, philosophical question-
What about it makes you love it?
(this is a real, curiosity type question, relating to why we admire, etc,
things that we also see as flawed, in some way.)
Bill, whose middle initial stands for curious, despite what his mother
thought it meant., here on Persimmon Hill.
Bill Aycock --- Persimmon Hill --- Woodville, Alabama, USA
--- (in the N.E. corner of the State)
also-- W4BSG -- Grid EM64vr
Paul Carlson on wed 13 nov 96
Hi Heather, One can usually slow down a runny glaze with an addition of
alumina. Make a set of test tiles. Make a 100 gram batch of your glaze for
each test tile. Increase the alumina content of each batch, and keep good
notes. Fire the test tiles and observe the results. It is my experience
that color generally suffers as alumina increases. I use EPK as my source of
alumina because it is local. There are many other sources to investigate.
Glaze testing of this sort is a great way to help you understand glaze
chemistry. Let us know your findings!
Paul Carlson
Paul Carlson Pottery
Archer, FL
william bosworth on thu 14 nov 96
Bill-- You asked why I love this glaze. Well good question! I like the
variation of color when it is layered. I also like the running somewhat.
It becomes a problem when I ruined a new shelve. The glaze is a light
yellow that pools orange in bowls and runs a light blue. I think it is
magnificent and the funny thing is it was an accident. By the way, I was
born in Alabama, and went to school at Auburn.
Heather
eaa@hargray.com
Beaufort, SC
>
>Heather-- I'm going to leave the technical answer to the real experts, who
>(probably) will first want to know more details of the formulation- but I
>have a more personal, philosophical question-
>
>What about it makes you love it?
>
>(this is a real, curiosity type question, relating to why we admire, etc,
>things that we also see as flawed, in some way.)
>
>Bill, whose middle initial stands for curious, despite what his mother
>thought it meant., here on Persimmon Hill.
>
>Bill Aycock --- Persimmon Hill --- Woodville, Alabama, USA
> --- (in the N.E. corner of the State)
>also-- W4BSG -- Grid EM64vr
>
>
Bill Aycock on fri 15 nov 96
At 08:52 AM 11/14/96 EST, you (Heather ) wrote: **** in part ****
>----------------------------Original message----------------------------
>Bill-- You asked why I love this glaze.
> The glaze is a light
>yellow that pools orange in bowls and runs a light blue.
>
>Heather
>
Heather- from your description, I can see many possibilities, and can see
justification for trying to adjust the characteristics. Good luck, and if
you can bring yourdelf to do so, how bout a recipe- I, for one would like to
play with the formultion.
light yellow, pools orange, runs blue- ? ? interesting !
Bill- with deep contemplation of these phenomena, on Persimmon Hill, where
its light fog, pooling wet, and running off everything.
Bill Aycock --- Persimmon Hill --- Woodville, Alabama, USA
--- (in the N.E. corner of the State)
also-- W4BSG -- Grid EM64vr
Tasha Olive on fri 10 sep 99
Joanne, Hi and no, the lowering of cobalt in your glaze would not have
caused it to run more than with the higher amount of colorant as cobalt is a
strong flux itself. Might try to lower the flux ( feldspar for instance) and
increasing by same amount your clay, say in 5% increments or easier still
just fire a cone or so lower if at all possible.Tasha
-----Original Message-----
From: Joanne Van Bezooyen
To: CLAYART@LSV.UKY.EDU
Date: Thursday, September 09, 1999 9:15 AM
Subject: runny glaze
>----------------------------Original message----------------------------
>I just tested a new glaze recipe I got off the list. It is very
>transparent, and it ran a LOT. What can I add to 'keep its drawers up",
>so to speak.
>Please help me stop it's running.
>
>Noxema Bottle Blue
>^6
>transparent, glossy
>
>custer feldspar.....38.1
>Dolomite.....10
>EPK.....9.6
>Silica.....9.5
>Zinc Oxide.....9.4
>Cobalt Carbonate.....3.5 (I used 2.5 to get a lighter blue...came out a
>steel blue...is this my problem?)
>
>Joanne in Tucson
Ron Roy on fri 8 sep 06
Hi Michele,
The total of all the ingrediants in your glaze is 535 without the chrome -
is that correct?
Adding more clay will eventually stop the running - but I'm sure the glaze
wsill change.
This is a very unstable glaze by the way - I hope you are not using it
where food acn be incontact with it.
There are toxicity issues with Lithium, Barium and Chrome and all the
ingredianys in this glaze will leach out when in contact with acidic foods.
Chrome is volitile during firing by the way - I hope your kiln is vented
properly and you are not breathing fumes while firing you work.
RR
>I just posted this but with my old email address so I'm posting it again
>correctly..
>
>I love this glaze but it's running more than I like. How do I reduce the
>running but keep the same lovely glaze?
>
>Thanks,
>Michele
>damicomichele@comcast.net
>
>Neph Sy 120
>Lithium Carbonate 65
>Whiting 15
>Barium Carb 115
>Ball clay 15
>Flint 155
>Fritt 3124 50
>Chrome OX 2.5
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Steve Slatin on fri 8 sep 06
Michele --
You don't say what cone you fire to. I do note that you're running
too high a melter ratio for a ^6 or above glaze. You've also got
an extremely high concentration of lithium, which can do some
strange things so I'm guessing the glaze was designed for a
low cone. You also have a rather high Si/Al ratio -- about 11.6.
If at whatever cone you're firing to you're too runny, the
solution will be in raising the stiffener level (alumina).
This is an absolute WAG, but if I wanted to keep the same
surface effects and color response in that glaze at whatever
cone it's fired to, I'd try adding 50 units of EPK. (I'm presuming
the ball clay is there for particle size, so I'm leaving it alone.)
Adding just that little bit of EPK gets your Si:Al ratio down to
8.44, and fluxes under 30% molar. You now have a reasonable
level of alumina, though the silica level is still a bit low.
I don't know if this will make it a stable glaze -- possibly not
with the low silica level -- but at least it should remain glossy
and not run off the side of your pots so readily.
Best wishes -- Steve S
Michele D'Amico wrote:
Hi,
I just posted this but with my old email address so I'm posting it again
correctly..
I love this glaze but it's running more than I like. How do I reduce the
running but keep the same lovely glaze?
Thanks,
Michele
damicomichele@comcast.net
Neph Sy 120
Lithium Carbonate 65
Whiting 15
Barium Carb 115
Ball clay 15
Flint 155
Fritt 3124 50
Chrome OX 2.5
---------------------------------
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Tom Buck on fri 8 sep 06
Michele D'Amico:
The standard way of citing a glaze recipe is to have it total
either 100+additives or 1000+additives; your citation does neither, so
perhaps some component was left out when you first found the recipe.
also, you do not provide the firing cone ... it could be Cone
04/03 or Cone 5/6 or somewhere inbetween.
It looks like a Cone 6 mix, so if this is true, then you have a
simple quick fix: add 80 weight units of Edgar Plastic Kaolin (EPK) to the
recipe as cited.
If you have some glaze mix on-hand, apply the Brongniart Formula
and add EPK as required for the onhand mix.
However, to make this a Cone 6 glaze that will not run and yet fit
a C6 claybody, I suggest you use the following revised recipe:
High barium C6 oxidation glaze
230 Nepheline syenite
80 Lithium carbonate
180 Barium carbonate
80 FF3124 frit
30 Old Mine #4 ballclay or equal
90 EPK
310 Flint/silica/quartz
total 1000
add 4.0 Chromium oxide (presumably Green Oxide, Cr2O3).
if you make food-ware, then make sure this glaze is on surfaces that will
not come into contact with food, since dissolved barium (Ba++ ion) is
toxic. if you wish to avoid Ba++ ion, use Whiting in place of Barium
Carbonate.
good tests. peace Tom B.
Tom Buck ) -- primary address.
"alias" or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
On Fri, 8 Sep 2006, Michele D'Amico wrote:
> Hi,
> I just posted this but with my old email address so I'm posting it again
> correctly..
>
> I love this glaze but it's running more than I like. How do I reduce the
> running but keep the same lovely glaze?
>
> Thanks,
> Michele
> damicomichele@comcast.net
>
> Neph Sy 120
> Lithium Carbonate 65
> Whiting 15
> Barium Carb 115
> Ball clay 15
> Flint 155
> Fritt 3124 50
> Chrome OX 2.5
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
Michele D'Amico on fri 8 sep 06
Hi,
I just posted this but with my old email address so I'm posting it again
correctly..
I love this glaze but it's running more than I like. How do I reduce the
running but keep the same lovely glaze?
Thanks,
Michele
damicomichele@comcast.net
Neph Sy 120
Lithium Carbonate 65
Whiting 15
Barium Carb 115
Ball clay 15
Flint 155
Fritt 3124 50
Chrome OX 2.5
Kathryn Hughes on sat 9 sep 06
I understand toxicity issues with barium and I'm hearing about lithium. Now I'm caught off guard by chrome oxide, as I use that in a glaze to produce reds. Is it safe to come in contact with food and drink after firing? Is the same for Manganese and lithium?
thank you! Kathryn In NC
Ron Roy wrote:
Hi Michele,
The total of all the ingrediants in your glaze is 535 without the chrome -
is that correct?
Adding more clay will eventually stop the running - but I'm sure the glaze
wsill change.
This is a very unstable glaze by the way - I hope you are not using it
where food acn be incontact with it.
There are toxicity issues with Lithium, Barium and Chrome and all the
ingredianys in this glaze will leach out when in contact with acidic foods.
Chrome is volitile during firing by the way - I hope your kiln is vented
properly and you are not breathing fumes while firing you work.
RR
>I just posted this but with my old email address so I'm posting it again
>correctly..
>
>I love this glaze but it's running more than I like. How do I reduce the
>running but keep the same lovely glaze?
>
>Thanks,
>Michele
>damicomichele@comcast.net
>
>Neph Sy 120
>Lithium Carbonate 65
>Whiting 15
>Barium Carb 115
>Ball clay 15
>Flint 155
>Fritt 3124 50
>Chrome OX 2.5
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
---------------------------------
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David Woof on sat 9 sep 06
Michele, here is a golden op to learn something about the individual
materials in your glaze recipe. It appears that there should be decimal
points in these numbers. Educating yourself about each material will allow
you to make educated guess decisions on where to put these decimal points
and with an experiment or two this may well work. Education is never wasted
even when we do not get the desired results. It may well open new doors for
you. Of course we can rely on the experts and calculation programs to help
us fumble thru the darkness but I think this contributes to the flacid and
dependent minds of our times, and in the times coming where only those with
agile minds will survive.
Best regards,
David
_________________________________
_________________________________
David Woof Studio
Clarkdale, Arizona
Ph. 928-821-3747 Fax. 866-881-3461
________________________________
________________________________
peering over the edge, reverently taking an irreverent look at everything.
Ron Roy on sun 10 sep 06
Dear Kathryn,
Stable glazes don't leach much of anything into food - the trick is
understanding which glazes are unstable - John Hesselberth and I have
written a book on the subject - it's for cone 6 glazes but the information
is applicable to other firing temperatures as well.
Some toxins are a problem through ingestion - ingest too much and your body
is affected in adverse ways. Some toxins are a problem through inhalation -
and some though skin contact.
There are some materials we use that volatilize during firing - manganese
and chrome are two of them - they are a danger to you and why I said you
should make sure your kiln is properly ventilated.
Even if you don't use those materials - there are toxins associated with
just firing clays - all kilns should be properly ventilated.
I instead of trying to summarize the literature on the toxicity of some of
the materials we use I am going to recommend a wonderful book by Monona
Rossol called "The Artists Complete Health and Safety Guide - ISBN
1-58115-204-3.
After reading the section on Ceramics - you will be much better equipped to
make decisions about which materials to use and how.
RR
>I understand toxicity issues with barium and I'm hearing about lithium.
>Now I'm caught off guard by chrome oxide, as I use that in a glaze to
>produce reds. Is it safe to come in contact with food and drink after
>firing? Is the same for Manganese and lithium?
> thank you! Kathryn In NC
>
>Ron Roy wrote:
> Hi Michele,
>
>The total of all the ingrediants in your glaze is 535 without the chrome -
>is that correct?
>
>Adding more clay will eventually stop the running - but I'm sure the glaze
>wsill change.
>
>This is a very unstable glaze by the way - I hope you are not using it
>where food acn be incontact with it.
>
>There are toxicity issues with Lithium, Barium and Chrome and all the
>ingredianys in this glaze will leach out when in contact with acidic foods.
>
>Chrome is volitile during firing by the way - I hope your kiln is vented
>properly and you are not breathing fumes while firing you work.
>
>RR
>
>
>>I just posted this but with my old email address so I'm posting it again
>>correctly..
>>
>>I love this glaze but it's running more than I like. How do I reduce the
>>running but keep the same lovely glaze?
>>
>>Thanks,
>>Michele
>>damicomichele@comcast.net
>>
>>Neph Sy 120
>>Lithium Carbonate 65
>>Whiting 15
>>Barium Carb 115
>>Ball clay 15
>>Flint 155
>>Fritt 3124 50
>>Chrome OX 2.5
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
>K0K 1H0
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
>
>
>---------------------------------
>Do you Yahoo!?
> Get on board. You're invited to try the new Yahoo! Mail.
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Kathryn Hughes on mon 11 sep 06
Ron Roy,thanks so much for your answers. They were very helpful. Now onto something else. Have you encountered any potters who have had are is having alot of fatty tumors growing along their arms? I think for me it has something to do when I'd swish the mang carb. with my bare hands up to my arms before someone told me that it was very poisonous. Idiot me. but I'm curious to know of any other potters who may have these problems or others. With warm regards, Kathryn
---------------------------------
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Snail Scott on tue 12 sep 06
At 08:43 PM 9/11/2006 -0700, Kathryn wrote:
...Have you encountered any potters who have had are is having alot of
fatty tumors growing along their arms? I think for me it has something to
do when I'd swish the mang carb. with my bare hands up to my arms before
someone told me that it was very poisonous. Idiot me...
Manganese carbonate is not absorbed through
the skin. The toxicity of the material is
in the vapors that are given off during firing,
not from the solid material at room temperature.
The hazard from vapors is quite serious, but
I have never seen any documentation of a health
hazard from solid manganese carb or dioxide.
Too many health warnings are so general as to
lead to this sort of confusion, and it's a
dang shame. It makes it hard to guard against
the real hazards when they get buried in
the general atmosphere of fear and confusion.
Very sorry to hear about your condition, but
it's unlikely that it's the manganese at fault.
I hope we hear from Dr. Edouard B. on this
one; he may have better information to pass
on to you and your doctor.
-Snail
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